Why Does IE9 Switch to Compatibility Mode and How Can I Prevent It?-CSS Tutorial-php.cn

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Why Does IE9 Switch to Compatibility Mode and How Can I Prevent It?

Mary-Kate Olsen

Dec 04, 2024 am 11:08 AM

Why Does IE9 Switch to Compatibility Mode and How Can I Prevent It?

IE9 Compatibility Mode and HTML5 Websites

Users encounter IE9 switching to compatibility mode on certain websites, rendering HTML5 content in a diminished fashion. This article investigates the underlying cause and provides a solution to maintain automatic compatibility mode.

Compatibility Mode Factors

In the absence of an X-UA-Compatible header, IE9 selects a compatibility mode based on several factors:

User-configured settings
Crashes caused by rendering issues
Default preferences for intranet sites
Microsoft's internal compatibility view list

Resolution

To ensure the desired compatibility mode, site authors can explicitly set it using the X-UA-Compatible meta tag or HTTP header. By specifying "IE=Edge," websites can force the use of the latest IE renderer, regardless of version.

Sample Code

<meta http-equiv="X-UA-Compatible" content="IE=Edge">

X-UA-Compatible: IE=Edge

By implementing this solution, websites can override any automatic compatibility mode settings, guaranteeing accurate rendering of HTML5 content in IE9 and subsequent versions.

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